Commit | Line | Data |
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7d9884b9 | 1 | /* Print Motorola 68k instructions for GDB, the GNU debugger. |
8970a55e | 2 | Copyright 1986, 1987, 1989, 1991, 1992 Free Software Foundation, Inc. |
dd3b648e RP |
3 | |
4 | This file is part of GDB. | |
5 | ||
99a7de40 | 6 | This program is free software; you can redistribute it and/or modify |
dd3b648e | 7 | it under the terms of the GNU General Public License as published by |
99a7de40 JG |
8 | the Free Software Foundation; either version 2 of the License, or |
9 | (at your option) any later version. | |
dd3b648e | 10 | |
99a7de40 | 11 | This program is distributed in the hope that it will be useful, |
dd3b648e RP |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
99a7de40 JG |
17 | along with this program; if not, write to the Free Software |
18 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ | |
dd3b648e | 19 | |
dd3b648e | 20 | #include "defs.h" |
dd3b648e | 21 | #include "symtab.h" |
7e258d18 | 22 | #include "opcode/m68k.h" |
dd3b648e | 23 | #include "gdbcore.h" |
8970a55e | 24 | #include "ieee-float.h" |
dd3b648e | 25 | |
1ab3bf1b JG |
26 | /* Local function prototypes */ |
27 | ||
28 | static int | |
29 | fetch_arg PARAMS ((unsigned char *, int, int)); | |
30 | ||
31 | static void | |
32 | print_base PARAMS ((int, int, FILE *)); | |
33 | ||
34 | static unsigned char * | |
35 | print_indexed PARAMS ((int, unsigned char *, CORE_ADDR, FILE *)); | |
36 | ||
37 | static unsigned char * | |
38 | print_insn_arg PARAMS ((char *, unsigned char *, unsigned char *, CORE_ADDR, | |
39 | FILE *)); | |
40 | ||
dd3b648e RP |
41 | /* 68k instructions are never longer than this many bytes. */ |
42 | #define MAXLEN 22 | |
43 | ||
44 | /* Number of elements in the opcode table. */ | |
45 | #define NOPCODES (sizeof m68k_opcodes / sizeof m68k_opcodes[0]) | |
46 | ||
47 | extern char *reg_names[]; | |
48 | char *fpcr_names[] = { "", "fpiar", "fpsr", "fpiar/fpsr", "fpcr", | |
49 | "fpiar/fpcr", "fpsr/fpcr", "fpiar-fpcr"}; | |
50 | ||
8970a55e JG |
51 | /* Define accessors for 68K's 1, 2, and 4-byte signed quantities. |
52 | The _SHIFT values move the quantity to the high order end of an | |
53 | `int' value, so it will sign-extend. Probably a few more casts | |
54 | are needed to make it compile without warnings on finicky systems. */ | |
55 | #define BITS_PER_BYTE 8 | |
56 | #define BYTE_SHIFT (BITS_PER_BYTE * ((sizeof (int)) - 1)) | |
57 | #define WORD_SHIFT (BITS_PER_BYTE * ((sizeof (int)) - 2)) | |
58 | #define LONG_SHIFT (BITS_PER_BYTE * ((sizeof (int)) - 4)) | |
dd3b648e | 59 | |
8970a55e | 60 | #define NEXTBYTE(p) (p += 2, ((int)(p[-1]) << BYTE_SHIFT) >> BYTE_SHIFT) |
dd3b648e RP |
61 | |
62 | #define NEXTWORD(p) \ | |
8970a55e | 63 | (p += 2, (((int)((p[-2] << 8) + p[-1])) << WORD_SHIFT) >> WORD_SHIFT) |
dd3b648e RP |
64 | |
65 | #define NEXTLONG(p) \ | |
8970a55e JG |
66 | (p += 4, (((int)((((((p[-4] << 8) + p[-3]) << 8) + p[-2]) << 8) + p[-1])) \ |
67 | << LONG_SHIFT) >> LONG_SHIFT) | |
dd3b648e | 68 | |
8970a55e | 69 | /* Ecch -- assumes host == target float formats. FIXME. */ |
dd3b648e RP |
70 | #define NEXTSINGLE(p) \ |
71 | (p += 4, *((float *)(p - 4))) | |
72 | ||
73 | #define NEXTDOUBLE(p) \ | |
74 | (p += 8, *((double *)(p - 8))) | |
dd3b648e RP |
75 | \f |
76 | /* Print the m68k instruction at address MEMADDR in debugged memory, | |
77 | on STREAM. Returns length of the instruction, in bytes. */ | |
78 | ||
79 | int | |
80 | print_insn (memaddr, stream) | |
81 | CORE_ADDR memaddr; | |
82 | FILE *stream; | |
83 | { | |
84 | unsigned char buffer[MAXLEN]; | |
85 | register int i; | |
86 | register unsigned char *p; | |
87 | register char *d; | |
88 | register int bestmask; | |
89 | int best; | |
90 | ||
1ab3bf1b | 91 | read_memory (memaddr, (char *) buffer, MAXLEN); |
dd3b648e RP |
92 | |
93 | bestmask = 0; | |
94 | best = -1; | |
95 | for (i = 0; i < NOPCODES; i++) | |
96 | { | |
97 | register unsigned int opcode = m68k_opcodes[i].opcode; | |
98 | register unsigned int match = m68k_opcodes[i].match; | |
99 | if (((0xff & buffer[0] & (match >> 24)) == (0xff & (opcode >> 24))) | |
100 | && ((0xff & buffer[1] & (match >> 16)) == (0xff & (opcode >> 16))) | |
101 | && ((0xff & buffer[2] & (match >> 8)) == (0xff & (opcode >> 8))) | |
102 | && ((0xff & buffer[3] & match) == (0xff & opcode))) | |
103 | { | |
104 | /* Don't use for printout the variants of divul and divsl | |
105 | that have the same register number in two places. | |
106 | The more general variants will match instead. */ | |
107 | for (d = m68k_opcodes[i].args; *d; d += 2) | |
108 | if (d[1] == 'D') | |
109 | break; | |
110 | ||
111 | /* Don't use for printout the variants of most floating | |
112 | point coprocessor instructions which use the same | |
113 | register number in two places, as above. */ | |
114 | if (*d == 0) | |
115 | for (d = m68k_opcodes[i].args; *d; d += 2) | |
116 | if (d[1] == 't') | |
117 | break; | |
118 | ||
119 | if (*d == 0 && match > bestmask) | |
120 | { | |
121 | best = i; | |
122 | bestmask = match; | |
123 | } | |
124 | } | |
125 | } | |
126 | ||
127 | /* Handle undefined instructions. */ | |
128 | if (best < 0) | |
129 | { | |
130 | fprintf_filtered (stream, "0%o", (buffer[0] << 8) + buffer[1]); | |
131 | return 2; | |
132 | } | |
133 | ||
134 | fprintf_filtered (stream, "%s", m68k_opcodes[best].name); | |
135 | ||
136 | /* Point at first word of argument data, | |
137 | and at descriptor for first argument. */ | |
138 | p = buffer + 2; | |
139 | ||
140 | /* Why do this this way? -MelloN */ | |
141 | for (d = m68k_opcodes[best].args; *d; d += 2) | |
142 | { | |
143 | if (d[0] == '#') | |
144 | { | |
145 | if (d[1] == 'l' && p - buffer < 6) | |
146 | p = buffer + 6; | |
147 | else if (p - buffer < 4 && d[1] != 'C' && d[1] != '8' ) | |
148 | p = buffer + 4; | |
149 | } | |
150 | if (d[1] >= '1' && d[1] <= '3' && p - buffer < 4) | |
151 | p = buffer + 4; | |
152 | if (d[1] >= '4' && d[1] <= '6' && p - buffer < 6) | |
153 | p = buffer + 6; | |
154 | if ((d[0] == 'L' || d[0] == 'l') && d[1] == 'w' && p - buffer < 4) | |
155 | p = buffer + 4; | |
156 | } | |
157 | ||
158 | d = m68k_opcodes[best].args; | |
159 | ||
160 | if (*d) | |
161 | fputs_filtered (" ", stream); | |
162 | ||
163 | while (*d) | |
164 | { | |
165 | p = print_insn_arg (d, buffer, p, memaddr + p - buffer, stream); | |
166 | d += 2; | |
167 | if (*d && *(d - 2) != 'I' && *d != 'k') | |
168 | fputs_filtered (",", stream); | |
169 | } | |
170 | return p - buffer; | |
171 | } | |
172 | ||
173 | static unsigned char * | |
174 | print_insn_arg (d, buffer, p, addr, stream) | |
175 | char *d; | |
176 | unsigned char *buffer; | |
177 | register unsigned char *p; | |
178 | CORE_ADDR addr; /* PC for this arg to be relative to */ | |
179 | FILE *stream; | |
180 | { | |
181 | register int val; | |
182 | register int place = d[1]; | |
183 | int regno; | |
184 | register char *regname; | |
185 | register unsigned char *p1; | |
8970a55e | 186 | double flval; |
dd3b648e RP |
187 | int flt_p; |
188 | ||
189 | switch (*d) | |
190 | { | |
191 | case 'C': | |
192 | fprintf_filtered (stream, "ccr"); | |
193 | break; | |
194 | ||
195 | case 'S': | |
196 | fprintf_filtered (stream, "sr"); | |
197 | break; | |
198 | ||
199 | case 'U': | |
200 | fprintf_filtered (stream, "usp"); | |
201 | break; | |
202 | ||
203 | case 'J': | |
204 | { | |
205 | static struct { char *name; int value; } names[] | |
206 | = {{"sfc", 0x000}, {"dfc", 0x001}, {"cacr", 0x002}, | |
207 | {"usp", 0x800}, {"vbr", 0x801}, {"caar", 0x802}, | |
208 | {"msp", 0x803}, {"isp", 0x804}}; | |
209 | ||
210 | val = fetch_arg (buffer, place, 12); | |
211 | for (regno = sizeof names / sizeof names[0] - 1; regno >= 0; regno--) | |
212 | if (names[regno].value == val) | |
213 | { | |
214 | fprintf_filtered (stream, names[regno].name); | |
215 | break; | |
216 | } | |
217 | if (regno < 0) | |
218 | fprintf_filtered (stream, "%d", val); | |
219 | } | |
220 | break; | |
221 | ||
222 | case 'Q': | |
223 | val = fetch_arg (buffer, place, 3); | |
224 | /* 0 means 8, except for the bkpt instruction... */ | |
225 | if (val == 0 && d[1] != 's') | |
226 | val = 8; | |
227 | fprintf_filtered (stream, "#%d", val); | |
228 | break; | |
229 | ||
230 | case 'M': | |
231 | val = fetch_arg (buffer, place, 8); | |
232 | if (val & 0x80) | |
233 | val = val - 0x100; | |
234 | fprintf_filtered (stream, "#%d", val); | |
235 | break; | |
236 | ||
237 | case 'T': | |
238 | val = fetch_arg (buffer, place, 4); | |
239 | fprintf_filtered (stream, "#%d", val); | |
240 | break; | |
241 | ||
242 | case 'D': | |
243 | fprintf_filtered (stream, "%s", reg_names[fetch_arg (buffer, place, 3)]); | |
244 | break; | |
245 | ||
246 | case 'A': | |
247 | fprintf_filtered (stream, "%s", | |
248 | reg_names[fetch_arg (buffer, place, 3) + 010]); | |
249 | break; | |
250 | ||
251 | case 'R': | |
252 | fprintf_filtered (stream, "%s", reg_names[fetch_arg (buffer, place, 4)]); | |
253 | break; | |
254 | ||
255 | case 'F': | |
256 | fprintf_filtered (stream, "fp%d", fetch_arg (buffer, place, 3)); | |
257 | break; | |
258 | ||
259 | case 'O': | |
260 | val = fetch_arg (buffer, place, 6); | |
261 | if (val & 0x20) | |
262 | fprintf_filtered (stream, "%s", reg_names [val & 7]); | |
263 | else | |
264 | fprintf_filtered (stream, "%d", val); | |
265 | break; | |
266 | ||
267 | case '+': | |
268 | fprintf_filtered (stream, "%s@+", | |
269 | reg_names[fetch_arg (buffer, place, 3) + 8]); | |
270 | break; | |
271 | ||
272 | case '-': | |
273 | fprintf_filtered (stream, "%s@-", | |
274 | reg_names[fetch_arg (buffer, place, 3) + 8]); | |
275 | break; | |
276 | ||
277 | case 'k': | |
278 | if (place == 'k') | |
279 | fprintf_filtered (stream, "{%s}", reg_names[fetch_arg (buffer, place, 3)]); | |
280 | else if (place == 'C') | |
281 | { | |
282 | val = fetch_arg (buffer, place, 7); | |
283 | if ( val > 63 ) /* This is a signed constant. */ | |
284 | val -= 128; | |
285 | fprintf_filtered (stream, "{#%d}", val); | |
286 | } | |
287 | else | |
288 | error ("Invalid arg format in opcode table: \"%c%c\".", | |
289 | *d, place); | |
290 | break; | |
291 | ||
292 | case '#': | |
293 | case '^': | |
294 | p1 = buffer + (*d == '#' ? 2 : 4); | |
295 | if (place == 's') | |
296 | val = fetch_arg (buffer, place, 4); | |
297 | else if (place == 'C') | |
298 | val = fetch_arg (buffer, place, 7); | |
299 | else if (place == '8') | |
300 | val = fetch_arg (buffer, place, 3); | |
301 | else if (place == '3') | |
302 | val = fetch_arg (buffer, place, 8); | |
303 | else if (place == 'b') | |
304 | val = NEXTBYTE (p1); | |
305 | else if (place == 'w') | |
306 | val = NEXTWORD (p1); | |
307 | else if (place == 'l') | |
308 | val = NEXTLONG (p1); | |
309 | else | |
310 | error ("Invalid arg format in opcode table: \"%c%c\".", | |
311 | *d, place); | |
312 | fprintf_filtered (stream, "#%d", val); | |
313 | break; | |
314 | ||
315 | case 'B': | |
316 | if (place == 'b') | |
317 | val = NEXTBYTE (p); | |
abefb1f1 | 318 | else if (place == 'B') |
8970a55e | 319 | val = NEXTBYTE (buffer); /* from the opcode word */ |
abefb1f1 | 320 | else if (place == 'w' || place == 'W') |
dd3b648e | 321 | val = NEXTWORD (p); |
abefb1f1 | 322 | else if (place == 'l' || place == 'L') |
dd3b648e RP |
323 | val = NEXTLONG (p); |
324 | else if (place == 'g') | |
325 | { | |
8970a55e | 326 | val = NEXTBYTE (buffer); |
dd3b648e RP |
327 | if (val == 0) |
328 | val = NEXTWORD (p); | |
329 | else if (val == -1) | |
330 | val = NEXTLONG (p); | |
331 | } | |
332 | else if (place == 'c') | |
333 | { | |
334 | if (buffer[1] & 0x40) /* If bit six is one, long offset */ | |
335 | val = NEXTLONG (p); | |
336 | else | |
337 | val = NEXTWORD (p); | |
338 | } | |
339 | else | |
340 | error ("Invalid arg format in opcode table: \"%c%c\".", | |
341 | *d, place); | |
342 | ||
343 | print_address (addr + val, stream); | |
344 | break; | |
345 | ||
346 | case 'd': | |
347 | val = NEXTWORD (p); | |
348 | fprintf_filtered (stream, "%s@(%d)", | |
349 | reg_names[fetch_arg (buffer, place, 3)], val); | |
350 | break; | |
351 | ||
352 | case 's': | |
353 | fprintf_filtered (stream, "%s", | |
354 | fpcr_names[fetch_arg (buffer, place, 3)]); | |
355 | break; | |
356 | ||
357 | case 'I': | |
358 | val = fetch_arg (buffer, 'd', 3); /* Get coprocessor ID... */ | |
359 | if (val != 1) /* Unusual coprocessor ID? */ | |
360 | fprintf_filtered (stream, "(cpid=%d) ", val); | |
361 | if (place == 'i') | |
362 | p += 2; /* Skip coprocessor extended operands */ | |
363 | break; | |
364 | ||
365 | case '*': | |
366 | case '~': | |
367 | case '%': | |
368 | case ';': | |
369 | case '@': | |
370 | case '!': | |
371 | case '$': | |
372 | case '?': | |
373 | case '/': | |
374 | case '&': | |
375 | ||
376 | if (place == 'd') | |
377 | { | |
378 | val = fetch_arg (buffer, 'x', 6); | |
379 | val = ((val & 7) << 3) + ((val >> 3) & 7); | |
380 | } | |
381 | else | |
382 | val = fetch_arg (buffer, 's', 6); | |
383 | ||
384 | /* Get register number assuming address register. */ | |
385 | regno = (val & 7) + 8; | |
386 | regname = reg_names[regno]; | |
387 | switch (val >> 3) | |
388 | { | |
389 | case 0: | |
390 | fprintf_filtered (stream, "%s", reg_names[val]); | |
391 | break; | |
392 | ||
393 | case 1: | |
394 | fprintf_filtered (stream, "%s", regname); | |
395 | break; | |
396 | ||
397 | case 2: | |
398 | fprintf_filtered (stream, "%s@", regname); | |
399 | break; | |
400 | ||
401 | case 3: | |
402 | fprintf_filtered (stream, "%s@+", regname); | |
403 | break; | |
404 | ||
405 | case 4: | |
406 | fprintf_filtered (stream, "%s@-", regname); | |
407 | break; | |
408 | ||
409 | case 5: | |
410 | val = NEXTWORD (p); | |
411 | fprintf_filtered (stream, "%s@(%d)", regname, val); | |
412 | break; | |
413 | ||
414 | case 6: | |
415 | p = print_indexed (regno, p, addr, stream); | |
416 | break; | |
417 | ||
418 | case 7: | |
419 | switch (val & 7) | |
420 | { | |
421 | case 0: | |
422 | val = NEXTWORD (p); | |
423 | fprintf_filtered (stream, "@#"); | |
424 | print_address (val, stream); | |
425 | break; | |
426 | ||
427 | case 1: | |
428 | val = NEXTLONG (p); | |
429 | fprintf_filtered (stream, "@#"); | |
430 | print_address (val, stream); | |
431 | break; | |
432 | ||
433 | case 2: | |
434 | val = NEXTWORD (p); | |
435 | print_address (addr + val, stream); | |
436 | break; | |
437 | ||
438 | case 3: | |
439 | p = print_indexed (-1, p, addr, stream); | |
440 | break; | |
441 | ||
442 | case 4: | |
443 | flt_p = 1; /* Assume it's a float... */ | |
444 | switch( place ) | |
445 | { | |
446 | case 'b': | |
447 | val = NEXTBYTE (p); | |
448 | flt_p = 0; | |
449 | break; | |
450 | ||
451 | case 'w': | |
452 | val = NEXTWORD (p); | |
453 | flt_p = 0; | |
454 | break; | |
455 | ||
456 | case 'l': | |
457 | val = NEXTLONG (p); | |
458 | flt_p = 0; | |
459 | break; | |
460 | ||
461 | case 'f': | |
462 | flval = NEXTSINGLE(p); | |
463 | break; | |
464 | ||
465 | case 'F': | |
466 | flval = NEXTDOUBLE(p); | |
467 | break; | |
468 | ||
469 | case 'x': | |
48079d66 | 470 | ieee_extended_to_double (&ext_format_68881, p, &flval); |
8970a55e | 471 | p += 12; |
dd3b648e RP |
472 | break; |
473 | ||
474 | case 'p': | |
8970a55e JG |
475 | p += 12; |
476 | flval = 0; /* FIXME, handle packed decimal someday. */ | |
dd3b648e RP |
477 | break; |
478 | ||
479 | default: | |
480 | error ("Invalid arg format in opcode table: \"%c%c\".", | |
481 | *d, place); | |
482 | } | |
483 | if ( flt_p ) /* Print a float? */ | |
484 | fprintf_filtered (stream, "#%g", flval); | |
485 | else | |
486 | fprintf_filtered (stream, "#%d", val); | |
487 | break; | |
488 | ||
489 | default: | |
490 | fprintf_filtered (stream, "<invalid address mode 0%o>", val); | |
491 | } | |
492 | } | |
493 | break; | |
494 | ||
495 | case 'L': | |
496 | case 'l': | |
497 | if (place == 'w') | |
498 | { | |
499 | char doneany; | |
500 | p1 = buffer + 2; | |
501 | val = NEXTWORD (p1); | |
502 | /* Move the pointer ahead if this point is farther ahead | |
503 | than the last. */ | |
504 | p = p1 > p ? p1 : p; | |
505 | if (val == 0) | |
506 | { | |
507 | fputs_filtered ("#0", stream); | |
508 | break; | |
509 | } | |
510 | if (*d == 'l') | |
511 | { | |
512 | register int newval = 0; | |
513 | for (regno = 0; regno < 16; ++regno) | |
514 | if (val & (0x8000 >> regno)) | |
515 | newval |= 1 << regno; | |
516 | val = newval; | |
517 | } | |
518 | val &= 0xffff; | |
519 | doneany = 0; | |
520 | for (regno = 0; regno < 16; ++regno) | |
521 | if (val & (1 << regno)) | |
522 | { | |
523 | int first_regno; | |
524 | if (doneany) | |
525 | fputs_filtered ("/", stream); | |
526 | doneany = 1; | |
527 | fprintf_filtered (stream, "%s", reg_names[regno]); | |
528 | first_regno = regno; | |
529 | while (val & (1 << (regno + 1))) | |
530 | ++regno; | |
531 | if (regno > first_regno) | |
532 | fprintf_filtered (stream, "-%s", reg_names[regno]); | |
533 | } | |
534 | } | |
535 | else if (place == '3') | |
536 | { | |
537 | /* `fmovem' insn. */ | |
538 | char doneany; | |
539 | val = fetch_arg (buffer, place, 8); | |
540 | if (val == 0) | |
541 | { | |
542 | fputs_filtered ("#0", stream); | |
543 | break; | |
544 | } | |
545 | if (*d == 'l') | |
546 | { | |
547 | register int newval = 0; | |
548 | for (regno = 0; regno < 8; ++regno) | |
549 | if (val & (0x80 >> regno)) | |
550 | newval |= 1 << regno; | |
551 | val = newval; | |
552 | } | |
553 | val &= 0xff; | |
554 | doneany = 0; | |
555 | for (regno = 0; regno < 8; ++regno) | |
556 | if (val & (1 << regno)) | |
557 | { | |
558 | int first_regno; | |
559 | if (doneany) | |
560 | fputs_filtered ("/", stream); | |
561 | doneany = 1; | |
562 | fprintf_filtered (stream, "fp%d", regno); | |
563 | first_regno = regno; | |
564 | while (val & (1 << (regno + 1))) | |
565 | ++regno; | |
566 | if (regno > first_regno) | |
567 | fprintf_filtered (stream, "-fp%d", regno); | |
568 | } | |
569 | } | |
570 | else | |
8970a55e | 571 | goto de_fault; |
dd3b648e RP |
572 | break; |
573 | ||
8970a55e | 574 | default: de_fault: |
dd3b648e RP |
575 | error ("Invalid arg format in opcode table: \"%c\".", *d); |
576 | } | |
577 | ||
578 | return (unsigned char *) p; | |
579 | } | |
580 | ||
581 | /* Fetch BITS bits from a position in the instruction specified by CODE. | |
582 | CODE is a "place to put an argument", or 'x' for a destination | |
583 | that is a general address (mode and register). | |
584 | BUFFER contains the instruction. */ | |
585 | ||
586 | static int | |
587 | fetch_arg (buffer, code, bits) | |
588 | unsigned char *buffer; | |
1ab3bf1b | 589 | int code; |
dd3b648e RP |
590 | int bits; |
591 | { | |
592 | register int val; | |
593 | switch (code) | |
594 | { | |
595 | case 's': | |
596 | val = buffer[1]; | |
597 | break; | |
598 | ||
599 | case 'd': /* Destination, for register or quick. */ | |
600 | val = (buffer[0] << 8) + buffer[1]; | |
601 | val >>= 9; | |
602 | break; | |
603 | ||
604 | case 'x': /* Destination, for general arg */ | |
605 | val = (buffer[0] << 8) + buffer[1]; | |
606 | val >>= 6; | |
607 | break; | |
608 | ||
609 | case 'k': | |
610 | val = (buffer[3] >> 4); | |
611 | break; | |
612 | ||
613 | case 'C': | |
614 | val = buffer[3]; | |
615 | break; | |
616 | ||
617 | case '1': | |
618 | val = (buffer[2] << 8) + buffer[3]; | |
619 | val >>= 12; | |
620 | break; | |
621 | ||
622 | case '2': | |
623 | val = (buffer[2] << 8) + buffer[3]; | |
624 | val >>= 6; | |
625 | break; | |
626 | ||
627 | case '3': | |
628 | case 'j': | |
629 | val = (buffer[2] << 8) + buffer[3]; | |
630 | break; | |
631 | ||
632 | case '4': | |
633 | val = (buffer[4] << 8) + buffer[5]; | |
634 | val >>= 12; | |
635 | break; | |
636 | ||
637 | case '5': | |
638 | val = (buffer[4] << 8) + buffer[5]; | |
639 | val >>= 6; | |
640 | break; | |
641 | ||
642 | case '6': | |
643 | val = (buffer[4] << 8) + buffer[5]; | |
644 | break; | |
645 | ||
646 | case '7': | |
647 | val = (buffer[2] << 8) + buffer[3]; | |
648 | val >>= 7; | |
649 | break; | |
650 | ||
651 | case '8': | |
652 | val = (buffer[2] << 8) + buffer[3]; | |
653 | val >>= 10; | |
654 | break; | |
655 | ||
656 | default: | |
657 | abort (); | |
658 | } | |
659 | ||
660 | switch (bits) | |
661 | { | |
662 | case 3: | |
663 | return val & 7; | |
664 | case 4: | |
665 | return val & 017; | |
666 | case 5: | |
667 | return val & 037; | |
668 | case 6: | |
669 | return val & 077; | |
670 | case 7: | |
671 | return val & 0177; | |
672 | case 8: | |
673 | return val & 0377; | |
674 | case 12: | |
675 | return val & 07777; | |
676 | default: | |
677 | abort (); | |
678 | } | |
679 | } | |
680 | ||
681 | /* Print an indexed argument. The base register is BASEREG (-1 for pc). | |
682 | P points to extension word, in buffer. | |
683 | ADDR is the nominal core address of that extension word. */ | |
684 | ||
685 | static unsigned char * | |
686 | print_indexed (basereg, p, addr, stream) | |
687 | int basereg; | |
688 | unsigned char *p; | |
dd3b648e | 689 | CORE_ADDR addr; |
1ab3bf1b | 690 | FILE *stream; |
dd3b648e RP |
691 | { |
692 | register int word; | |
693 | static char *scales[] = {"", "*2", "*4", "*8"}; | |
694 | register int base_disp; | |
695 | register int outer_disp; | |
696 | char buf[40]; | |
697 | ||
698 | word = NEXTWORD (p); | |
699 | ||
700 | /* Generate the text for the index register. | |
701 | Where this will be output is not yet determined. */ | |
702 | sprintf (buf, "[%s.%c%s]", | |
703 | reg_names[(word >> 12) & 0xf], | |
704 | (word & 0x800) ? 'l' : 'w', | |
705 | scales[(word >> 9) & 3]); | |
706 | ||
707 | /* Handle the 68000 style of indexing. */ | |
708 | ||
709 | if ((word & 0x100) == 0) | |
710 | { | |
711 | print_base (basereg, | |
712 | ((word & 0x80) ? word | 0xff00 : word & 0xff) | |
713 | + ((basereg == -1) ? addr : 0), | |
714 | stream); | |
715 | fputs_filtered (buf, stream); | |
716 | return p; | |
717 | } | |
718 | ||
719 | /* Handle the generalized kind. */ | |
720 | /* First, compute the displacement to add to the base register. */ | |
721 | ||
722 | if (word & 0200) | |
723 | basereg = -2; | |
724 | if (word & 0100) | |
725 | buf[0] = 0; | |
726 | base_disp = 0; | |
727 | switch ((word >> 4) & 3) | |
728 | { | |
729 | case 2: | |
730 | base_disp = NEXTWORD (p); | |
731 | break; | |
732 | case 3: | |
733 | base_disp = NEXTLONG (p); | |
734 | } | |
735 | if (basereg == -1) | |
736 | base_disp += addr; | |
737 | ||
738 | /* Handle single-level case (not indirect) */ | |
739 | ||
740 | if ((word & 7) == 0) | |
741 | { | |
742 | print_base (basereg, base_disp, stream); | |
743 | fputs_filtered (buf, stream); | |
744 | return p; | |
745 | } | |
746 | ||
747 | /* Two level. Compute displacement to add after indirection. */ | |
748 | ||
749 | outer_disp = 0; | |
750 | switch (word & 3) | |
751 | { | |
752 | case 2: | |
753 | outer_disp = NEXTWORD (p); | |
754 | break; | |
755 | case 3: | |
756 | outer_disp = NEXTLONG (p); | |
757 | } | |
758 | ||
759 | fprintf_filtered (stream, "%d(", outer_disp); | |
760 | print_base (basereg, base_disp, stream); | |
761 | ||
762 | /* If postindexed, print the closeparen before the index. */ | |
763 | if (word & 4) | |
764 | fprintf_filtered (stream, ")%s", buf); | |
765 | /* If preindexed, print the closeparen after the index. */ | |
766 | else | |
767 | fprintf_filtered (stream, "%s)", buf); | |
768 | ||
769 | return p; | |
770 | } | |
771 | ||
772 | /* Print a base register REGNO and displacement DISP, on STREAM. | |
773 | REGNO = -1 for pc, -2 for none (suppressed). */ | |
774 | ||
775 | static void | |
776 | print_base (regno, disp, stream) | |
777 | int regno; | |
778 | int disp; | |
779 | FILE *stream; | |
780 | { | |
781 | if (regno == -2) | |
782 | fprintf_filtered (stream, "%d", disp); | |
783 | else if (regno == -1) | |
784 | fprintf_filtered (stream, "0x%x", disp); | |
785 | else | |
786 | fprintf_filtered (stream, "%d(%s)", disp, reg_names[regno]); | |
787 | } |